CVE-2006-6730
OpenBSD and NetBSD permit usermode code to kill the display server and write to the X.Org /dev/xf86 device, which allows local users with root privileges to reduce securelevel by replacing the System Management Mode (SMM) handler via a write to an SMRAM address within /dev/xf86 (aka the video card memory-mapped I/O range), and then launching the new handler via a System Management Interrupt (SMI), as demonstrated by a write to Programmed I/O port 0xB2.
Key facts
- CVSS score
- 6.6 (v2.0)
- Severity
- MEDIUM
- CVSS vector
AV:L/AC:M/Au:S/C:C/I:C/A:C- EPSS score
- 0.3% (18th percentile)
- In CISA KEV
- No
- In EU EUVD
- Yes (EUVD-2006-6713)
- Published
- December 26, 2006
- NVD last modified
- June 16, 2026
- Status
- Modified
EU Vulnerability Database (EUVD)
This vulnerability is also tracked by ENISA as EUVD-2006-6713 in the EU Vulnerability Database. Last updated in EUVD on August 7, 2024.
View on the EU Vulnerability DatabaseAffected products
- netbsd / netbsd
- openbsd / openbsd
References
- http://lists.freedesktop.org/archives/xorg/2004-June/000927.html
- http://www.cansecwest.com/slides06/csw06-duflot.ppt
- http://www.securityfocus.com/archive/1/454379/100/0/threaded
- http://www.securityfocus.com/archive/1/454510/100/0/threaded
- http://www.securityfocus.com/archive/1/454706/100/0/threaded
- http://www.ssi.gouv.fr/fr/sciences/fichiers/lti/cansecwest2006-duflot-paper.pdf
Last updated September 17, 2026 · Source: NVD, CISA KEV, FIRST.org EPSS
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